TROUBLESHOOTING
Part. No. 2400M2501_6 Touchpoint Pro
144 Technical Handbook
Wait for the Inhibit Delay time to elapse. (If the Power-
On Delay or Fault Recovery Delay is enabled, the
system will remain in Inhibit for a period defined by the
Inhibit Delay Time.) Please refer to Ch. 9.3.13 Inhibit
Delay Settings
Sensor /
Transmitter is
signalling Inhibit
The Sensor / Transmitter may be in a start-up
sequence, or may have been inhibited for maintenance.
Refer to the Input Details for that channel from the
Inputs screen.
There is a
discrepancy
between the
sensor reading
and the value
displayed by
Touchpoint Pro
The mA loop
requires
calibration
Touchpoint Pro converts the 4-20 mA signal it receives
from the sensor to a gas reading. If the discrepancy is
significant,
re-calibrate the 4-20 mA loop by forcing the sensor
output to 4 mA then 20 mA, see Commissioning,
Calibrating a mA input channel
Error ‘Calibration
Signal Too High’
occurs when
calibrating the mA
loop
The parameter
‘Maximum Span
Signal’ has been
exceeded (default
value 20 mA)
Review the configuration of the channel. Under
Calibration Settings, verify the value Maximum Span
Signal. If necessary, use a lower forced mA value to
calibrate the channel. Verify that the transmitter is
operating correctly.
HART
communication
with the
corresponding
field device
HART communication with the field device may appear
as a fluctuation on the incoming signal. This will clear
when HART communication ceases.
Verify that the system has a Bus Interface Board (BIB)
fitted. Check the wiring between the Control Module
terminal blocks TB6 and TB7 and the host computer
system port. Try swapping over TDA and TDB.
Check that the serial communication configuration
parameters of the host computer system and
Touchpoint Pro are the same.
Ensure that the bus is correctly terminated. If this is the
case remove the bus terminators and retry
communication.
Consider adding network bias resistors. Please refer to
Ch. 11 Configuring Modbus for further details.
Communication
data errors
Check the data signal wiring is not routed near sources
of electrical noise. Check for earth loops. Ensure that
the bus is correctly terminated. If this is the case remove
the bus terminators and retry communication.
Consider adding network bias resistors.
If possible use an oscilloscope to examine the signals
on the highway and take appropriate corrective action.
No response from
Touchpoint Pro
Check the address parameter used in requests issued
by the host computer system matches the address
allocated to the slave node. In multi-drop systems check
that all nodes have a unique address.
Module is still
showing as
present and
available for
configuration in
the System Setup
Module has not
been properly
removed from the
system
Follow the instructions to remove a module from the
system, see Maintenance, How to Remove or
Decommission an I/O Module
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